Setting method of underground throttle technological parameter

Abstract

The invention discloses a setting method of an underground throttle technological parameter. The method comprises setting the depth of setting of an underground throttling device. The specific process comprises that S1, the smallest depth of setting of the throttling device is assigned L0 and temperature t1 and pressure in an upstream of a throttling nipple in the L0 depth position are confirmed through gas-liquid two-phase flow temperature and a pressure prediction model; S2, according to the t1 and the pressure in the L0 position and composition of known natural gas, temperature t2 in a downstream of the throttling nipple is confirmed through a gas-liquid two-phase flow temperature reducing model; S3, aqua-complex generating temperature th in the L0 position is confirmed through an aqua-complex prediction model; S4, if the t2 is lower than the th, the L0 is assigned again and then the steps of S1-S4 are repeated until a critical value that the t2>=th is found; and S5 the depth of setting of the throttling device is set to be more than or equal to the L0 under the critical value of the t2. The setting method of the down hole throttle technological parameter has applicability for both a dry gas pool and a condensate gas pool, important guarantee is offered to efficient development in a condensate gas pool block and the problem that a gas well is frozen and blocked is effectively solved.

Description

technical field [0001] The invention relates to downhole throttling technology, in particular to a method for quickly and effectively setting downhole throttling process parameters according to the wellhead pressure, output and geothermal gradient of a gas well. Background technique [0002] For gas wells, especially when the gas is dense or contains CO 2 and H 2 When the acid gas such as S is easily soluble in water, hydrate blockage is prone to occur in the wellbore near the wellhead, which seriously affects the normal production of the gas well. The downhole throttling process technology installs the throttle at an appropriate position in the tubing to achieve throttling and pressure reduction in the wellbore. At the same time, it makes full use of ground temperature heating to restore the wellhead temperature after throttling to the temperature before throttling and prevent hydrate formation. The running depth and choke nozzle diameter of the choke are the key factors ...

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Problems solved by technology

[0005] (2) At present, the optimization theory of downhole choke parameters for condensate gas wells is complicated, and it is difficult for field workers to accurately grasp and design. The theoretical model does not have guiding significance for on-site construction. Therefore, it is necessary to conduct in-depth research on the setting of downhole choke parameters for condensate gas wells. Research

[0006] In addition, the existing technology only has a downhole choke parameter setting method for a single well, and no in-depth research has been carried out on the influence of different production ratios, different geothermal gradients, and different wellhead pressures on the downhole choke parameter design.

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